special bug about this - or can we discuss this here as well?
be ifup <nickname> or ifup <deviceid>.
saying "ifup eth0" even if eth0 has a different nickname.
initscript that calls dhclient should provide the config file name.
Please attach the config files in use.
Whatever ifcfg file is causing the error, and your /etc/modules.conf.
I wrote this bug report.  Maybe it got fixed.